JPH0545360U - solenoid valve - Google Patents

Abstract

(57) [Abstract] [Purpose] The electromagnetic force of the pilot spring 18 of the solenoid valve provided with the auxiliary valve 2 in addition to the main valve 1 in order to reduce the fluid resistance when opening from the closed state Even if it is made small, the valve can be completely opened, and the suction force and power consumption required for opening the valve are made smaller than before. [Structure] A cylindrical body 26 made of a magnetic material during the opening of the main valve 1.
The valve body 5 continues to move even if the load of the pilot spring 18 and the load of the valve spring 10 are balanced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a solenoid valve. The solenoid valve of the present invention is used, for example, as a gas cutoff valve.

[0002]

[Prior Art]

 Conventionally, as a solenoid valve, there is known a solenoid valve that opens a sub valve prior to opening of a main valve in order to reduce fluid resistance when the valve is opened from a closed state. FIG. 7 shows a conventional example of this type of electromagnetic valve. First, the sub valve 2 is opened and then the main valve 1 is opened from the fully closed state of FIG.

The solenoid valve of FIG. 7 is configured as follows. The valve body 5 that contacts and separates from the valve seat 4 formed in the fluid passage 3 is elastically urged in the valve closing direction by the valve spring 10, and the auxiliary valve body 11 that contacts and separates from the auxiliary valve seat 6 formed in the valve body 5 is centered. It is attached to the valve body side end of the plunger 12 that advances and retracts toward the post 23. The valve body 5 has a valve body 7 and a valve holder 8, and has a passage 9 through which a fluid flows when the sub valve 2 is opened. A recess 13 is formed at the valve body side end of the plunger 12, and one end of a rod 14 is slidably inserted into the recess 13. The other end of the rod 14 is connected to the valve body 5 by a retaining ring 15. A spring seat 16 is attached to the inner peripheral edge of the opening of the recess 13, a spring seat 17 is formed at one end of the rod 14, and a pilot spring 18 is interposed between the spring seat 16 and the spring seat 17. 19 is a bidirectional solenoid that moves the plunger 12 by energization, 20 is a permanent magnet for holding the plunger 12 by itself, and a magnetic circuit is formed by the yoke 21, the flange 22, the permanent magnet 20, the plunger 12 and the center post 23. To be done. Reference numeral 24 is a non-magnetic plunger guide, and 25 is a non-magnetic lower case.

When the solenoid 19 is energized in the direction in which the magnetic force of the permanent magnet 20 is strengthened from the fully closed state of FIG. 7, the plunger 12 propels the pilot spring 18 toward the center post 23 while compressing the pilot spring 18. Opens. Then, the plunger 12 continues to move, the pilot spring 18 continues to be compressed, and when the load for pushing up the spring seat portion 17 of the pilot spring 18 becomes larger than the load for pushing down the valve body 5 of the valve spring 10, The valve body 5 is lifted via 14 and the main valve 1 is thereby opened.

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, when the load of the pilot spring 18 and the load of the valve spring 10 are balanced during the opening of the main valve 1, the movement of the valve body 5 stops at that point. Therefore, in order to avoid this, a spring having a larger spring force than the valve spring 10 is used as the pilot spring 18. Therefore, a large suction force is required to suck the plunger while compressing the pilot spring 18 having a large spring force, and high power is required.

[0006]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised to solve the above-mentioned problems in the prior art, and in order to achieve this object, a center post and a plunger that moves forward and backward toward the center post. A solenoid disposed on the outer peripheral side of the center post, a permanent magnet disposed on the outer peripheral side of the plunger, a valve element that comes into contact with and separates from a valve seat provided in the fluid passage, and a valve closing direction of the valve element. Valve spring that elastically biases the valve, a sub-valve seat provided on the valve body, a sub-valve body provided at an end of the plunger on the valve body side, and a sub-valve body that comes into contact with and separates from the sub-valve seat, and a valve of the plunger. A recess provided at the body-side end, a rod having one end slidably inserted into the recess and the other end connected to the valve body, a spring seat provided at the inner peripheral edge of the opening of the recess, and the rod The spring seat on one end of the In a solenoid valve having a spring seat and a pilot spring interposed between the spring seat portion, a solenoid valve made of a magnetic material, which is provided in the valve body and is movably inserted between the plunger and the permanent magnet. Provided is an electromagnetic valve having a cylindrical body.

[0007]

[Action]

 Even if the load of the pilot spring and the load of the valve spring may be balanced during the opening of the main valve, the magnetic cylindrical body may be sucked, but by sucking this cylindrical body Continue to move.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. The solenoid valve has the following features with respect to the above-mentioned conventional technology.

That is, as shown in FIG. 1, a cylindrical body 26 made of magnetic material is concentrically provided upright on the plunger 12 side (upper side in the drawing) of the valve holder 8 of the valve body 5. The cylindrical body 26 is inserted into an annular recess 27 formed on the outer peripheral surface of the plunger 12 so as to be relatively movable, and as shown in FIG. 4, when the valve is opened, it is attracted by the magnetic force between the plunger 12 and the permanent magnet 20. It is like this. Other configurations are the same as those of the conventional example.

When the solenoid 19 is energized in the direction in which the magnetic force of the permanent magnet 20 is strengthened from the fully closed state of FIG. 1, the plunger 12 propels the pilot spring 18 toward the center post 23 while compressing the pilot spring 18, which causes the FIG. As shown, the sub-valve 2 opens first. When the load for pushing up the spring seat portion 17 of the pilot spring 18 becomes larger than the load for pushing down the valve body 5 of the valve spring 10, the valve body 5 is lifted via the rod 14 as shown in FIG. As a result, the cylindrical body 26 approaches the permanent magnet 20 and is attracted by this amount, and as a result, the main valve 1 is completely opened, as shown in FIG. Therefore, even if the load of the pilot spring 18 and the load of the valve spring 10 are balanced by the suction of the cylindrical body 26, the movement of the valve body 5 can be continued, that is, the pilot spring. The spring force of 18 can be made smaller than the conventional one, as shown in FIG.

FIG. 5 shows a second embodiment of the present invention, in which the cylindrical body 26 is integrally formed with a substantially plate-shaped magnetic sub-plate 28.

[0012]

[Effect of the device]

 The present invention has the following effects. That is, when the valve is opened, the magnetic cylinder provided on the valve body is sucked, so even if the load of the pilot spring and the load of the valve spring balance, the valve body continues to move and the pilot The valve can be completely opened even if the spring force of the spring is made smaller than before. Therefore, the suction force and power consumption required for opening the valve can be made smaller than before.

[Brief description of drawings]

FIG. 1 is a sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the operation of the solenoid valve.

FIG. 3 is a sectional view showing the operation of the solenoid valve.

FIG. 4 is a sectional view showing the operation of the solenoid valve.

FIG. 5 is a sectional view of a solenoid valve according to another embodiment of the present invention.

FIG. 6 is a graph showing suction characteristics

FIG. 7 is a sectional view of a solenoid valve according to a conventional example.

[Explanation of reference symbols] 1 main valve 2 auxiliary valve 3 fluid passage 4 valve seat 5 valve body 6 auxiliary valve seat 7 valve body main body 8 valve holder 9 passage 10 valve spring 11 auxiliary valve body 12 plunger 13 recess 14 rod 15 retaining ring 16 Spring seat 17 Spring seat 18 Pilot spring 19 Solenoid 20 Permanent magnet 21 Yoke 22 Flange 23 Center post 24 Plunger guide 25 Lower case 26 Cylindrical body 27 Annular recess 28 Sub-plate

Claims (1)

[Scope of utility model registration request] 1. A center post 23, a plunger 12 that advances and retracts toward the center post 23, and a solenoid 19 arranged on the outer peripheral side of the center post 23.
And a permanent magnet 20 arranged on the outer peripheral side of the plunger 12, and a valve body 5 that comes into contact with and separates from a valve seat 4 provided in the fluid passage 3.
A valve spring 10 for elastically biasing the valve body 5 in the valve closing direction, a sub valve seat 6 provided on the valve body 5, and a sub valve seat provided on the valve body side end portion of the plunger 12. 6
To the valve body, a recess 13 provided at the valve body side end of the plunger 12, and a rod having one end slidably inserted into the recess 13 and the other end connected to the valve body 5. 1
4 and a spring seat 1 provided on the inner peripheral edge of the opening of the recess 13.
6 and a spring seat portion 17 provided at one end of the rod 14.
And a pilot spring 18 interposed between the spring seat 16 and the spring seat portion 17, the solenoid valve being provided in the valve body 5 and moving between the plunger 12 and the permanent magnet 20. An electromagnetic valve having a cylindrical body 26 made of a magnetic material that can be freely inserted.